1 files changed, 102 insertions, 0 deletions
diff --git a/release/src/linux/linux/scripts/squashfs/lzma/C/7zip/Compress/LZ/LZInWindow.cpp b/release/src/linux/linux/scripts/squashfs/lzma/C/7zip/Compress/LZ/LZInWindow.cpp
new file mode 100644
index 00000000..a7b7a387
--- /dev/null
+++ b/release/src/linux/linux/scripts/squashfs/lzma/C/7zip/Compress/LZ/LZInWindow.cpp
@@ -0,0 +1,102 @@
+// LZInWindow.cpp
+
+#include "StdAfx.h"
+
+#include "LZInWindow.h"
+#include "../../../Common/MyCom.h"
+#include "../../../Common/Alloc.h"
+
+void CLZInWindow::Free()
+{
+  ::BigFree(_bufferBase);
+  _bufferBase = 0;
+}
+
+bool CLZInWindow::Create(UInt32 keepSizeBefore, UInt32 keepSizeAfter, UInt32 keepSizeReserv)
+{
+  _keepSizeBefore = keepSizeBefore;
+  _keepSizeAfter = keepSizeAfter;
+  _keepSizeReserv = keepSizeReserv;
+  UInt32 blockSize = keepSizeBefore + keepSizeAfter + keepSizeReserv;
+  if (_bufferBase == 0 || _blockSize != blockSize)
+  {
+    Free();
+    _blockSize = blockSize;
+    if (_blockSize != 0)
+      _bufferBase = (Byte *)::BigAlloc(_blockSize);
+  }
+  _pointerToLastSafePosition = _bufferBase + _blockSize - keepSizeAfter;
+  if (_blockSize == 0)
+    return true;
+  return (_bufferBase != 0);
+}
+
+
+HRESULT CLZInWindow::Init(ISequentialInStream *stream)
+{
+  _stream = stream;
+  _buffer = _bufferBase;
+  _pos = 0;
+  _streamPos = 0;
+  _streamEndWasReached = false;
+  return ReadBlock();
+}
+
+/*
+void CLZInWindow::ReleaseStream()
+{
+  _stream.Release();
+}
+*/
+
+///////////////////////////////////////////
+// ReadBlock
+
+// In State:
+//   (_buffer + _streamPos) <= (_bufferBase + _blockSize)
+// Out State:
+//   _posLimit <= _blockSize - _keepSizeAfter;
+//   if(_streamEndWasReached == false):
+//     _streamPos >= _pos + _keepSizeAfter
+//     _posLimit = _streamPos - _keepSizeAfter;
+//   else
+//          
+  
+HRESULT CLZInWindow::ReadBlock()
+{
+  if(_streamEndWasReached)
+    return S_OK;
+  while(true)
+  {
+    UInt32 size = UInt32(_bufferBase - _buffer) + _blockSize - _streamPos;
+    if(size == 0)
+      return S_OK;
+    UInt32 numReadBytes;
+    RINOK(_stream->Read(_buffer + _streamPos, size, &numReadBytes));
+    if(numReadBytes == 0)
+    {
+      _posLimit = _streamPos;
+      const Byte *pointerToPostion = _buffer + _posLimit;
+      if(pointerToPostion > _pointerToLastSafePosition)
+        _posLimit = (UInt32)(_pointerToLastSafePosition - _buffer);
+      _streamEndWasReached = true;
+      return S_OK;
+    }
+    _streamPos += numReadBytes;
+    if(_streamPos >= _pos + _keepSizeAfter)
+    {
+      _posLimit = _streamPos - _keepSizeAfter;
+      return S_OK;
+    }
+  }
+}
+
+void CLZInWindow::MoveBlock()
+{
+  BeforeMoveBlock();
+  UInt32 offset = UInt32(_buffer - _bufferBase) + _pos - _keepSizeBefore;
+  UInt32 numBytes = UInt32(_buffer - _bufferBase) + _streamPos -  offset;
+  memmove(_bufferBase, _bufferBase + offset, numBytes);
+  _buffer -= offset;
+  AfterMoveBlock();
+}